Question

Lisa read 1/3

of a book in the morning, and she read some more at night. By the end of the day, she still had 1/5
of the book left to read. How much of the book did Lisa read at night?

Answer 1

If Lisa read 1/3 of the book in the morning, there are still 2/3 left of the book to read, considering the full book is 3/3. At the end of the day, she only had 1/5 left to read. So, we need to find a common denominator between 2/3 and 1/5. A common denominator of 2/3 and 1/5 is 15: 10/15 and 3/15. Now, we need to subtract these 2. 10/15 - 3/15 = 7/15. Lisa read 7/15 of the book at night.